BJP leader Mukul Roy was among the four people booked on Sunday in connection with the killing of Trinamool Congress MLA Satyajit Biswas. Roy, is a former TMC member of Parliament, who defected to the BJP last year after his relations soured with Chief Minister Mamata Banerjee.

Satyajit Biswas, 41, was shot from point-blank range by unidentified assailants Saturday evening inside a Saraswati puja marquee at Phoolbari area in the district bordering Bangladesh. He was immediately taken to a local hospital where doctors announced him “brought dead”.

The Mamata Banerjee-led Trinamool Congress has blamed the BJP for the murder. West Bengal education minister Partha Chatterjee said, "A dangabaz [riotous] blood thirsty party like the BJP is capable of such acts. People of this country know it well. The way they have been provoking people, it's the result of such acts."

However, BJP state president Dilip Ghosh denied the charges and claimed that the killing might be the result of infighting in the TMC. "The allegations are baseless. The BJP is not at all involved in the case. Those who are blaming us are actually trying to hide their own sins," Ghosh said.

The West Bengal Police has so far arrested three people in the case who have also been named in the FIR. The department has also suspended officer-In-charge of Hanskhali Police station.